Steam-boiler



(No Model.)

W. J. AUSTIN. STEAM BOILER.

No. 460,299. Patented Sept; 29, 1891.

UNITED STATES PATENT OFFICE.

VILLIAM JARVIS AUSTIN, OF FOND DU LAC, \VISGONSIN.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 460,299, dated September 29,1891.

Application filed March 3, 1887. Serial No. 229,638. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM JARVIS AUs- TIN, a citizen of the United States, residing at Fond du Lac, in the county of Fond du Lac, State of Visconsin, have invented certain new and useful Improvements in Steam- Boilers, of which the following is a specification, reference being had therein to the accom panying drawings.

My invention relates to fine and tubular boilers; and the objects of my improvement areto obtain a large amount of heating-surface, effect economy in fuel, and produce a good circulation in the boiler and the gratebars thereof. I accomplish these objects by the construction illustrated in the accompanying drawings, in which- Figure l is a longitudinal vertical section of a boiler constructed in accordance with my invention. Fig. 2 is an end view of the front portion of the same with the front plate of the smoke-chamber removed. Fig. 3 is an end View of the rear portion of the same with the rear plate of the smoke chamber removed. Fig. 4 is a top View of the front end of the grate-bars.

In said drawings, A represents the shell of the boiler, preferably in the form of a horizontal cylinder of uniform diameter from one to the other, the ends A andA being perforated to receive the fineshereinafterdescribed. The largest screw B is nearlyhalf the diame' ter of the shellA, and is secured to the ends A A so that its bottom is from three to five inches from the bottom of the shell and parallel therewith. This flue B constitutes the firebox of the boiler, and conducts the pro ducts of combustion to the rear end of the boiler. To said end of boiler is secured a short cylinder A to form, with the rear plate A, a smoke-chamber C, from which the products of combustion are returned to the front end of boiler through series of small horizontal flues D, passing through the heads of the boiler alongside of the large flue B, as a horizontal plate 0 across this smoke-chamber prevents the flame and smoke from ascending directly to the stack G. To the front end of the boiler is also secured a short cylinder A, to form a smoke-chamber E to arrest and direct the products of combustion back to the rear end of the boiler through the flues F. To

complete the chamber E, a segmental plate A is secured to the front end of the cylinder A and the lower edge of said plate bears upon a shelf A resting upon the front end of the grate-bars, while its middle portion encircles the front edge of the large flue B that is eX- tended for that purpose beyond the front of the boiler-shell. The fines F are intended to be mostly within the steam-space of the boiler, and by this means the steam becomes superheated.

To produce a rapid circulation of the waterin the boiler and increase its steaming capacity, said boiler is provided with tubular grate-bars 71, that are placed within the flue B and extend substantially the whole length thereof. The front portion extends horizontally any desired length to support the combustibles. The middle portion extends upward at an angle of about forty-five degrees to form a bridge-wall h and the rear portion extends substantially horizontally to the rear end, where they terminate into a larger crosstube 71 The rear end of the gratebars or this tube 7L3 is connected with the rear end of the boiler by means of two bent tubes 77., that enter therein nearits bottom. The front ends of the grate-bars are connected together to a larger tube 7r, that lies transversely across the front end of the boiler. This tube is connected with the interiorof the boiler by means of two short tubes it, that enter it near its bottom.

By having the grate-bars in one piece, from one end to the other, and the upwardly-bent portion 7L2 between the two ends, the gratebars are capable of a large amount of expansion without straining their connections with the boiler. The circulation of water through them is rapid and prevents the accumulation of scale and sediment, and as the gratebars are connected at both ends with the boiler a rapid circulation lengthwise thereof is also produced.

Water is fed to the boiler through a suitable opening, as 70, and the contents of the boilercan be blown off from both ends through cocks placed upon the openings Z, near the bottom of the boiler, and through the opening m in the cross-pipe 7L5 at the front end of the grate-bars.

Having now fully described my invention, I claim 1. In a steam-boiler, the combination of the horizontal shellA, and the fire-box flue B therein, with a series of grate-bars consisting" of l tubes of uniform diameter throughout their length, having a portion at each end extendsubstantiallyas and for the purpose described. ing horizontally and the middle portion bent In testimony whereof I aflix my signature in upwardly, the ends of said grate-bars being presence of two witnesses. connected to the boiler, substantially as and T for the purpose described WILLIAM JARVIS AUSTI1\.

2. The combination of the shell of a boiler Witnesses; and the fire-box flue therein, with a series of WV. F. SEALY. tubular grate-bars having a portion at each THOS. \VATSON.

end extending substantially horizontally and the middle port-ion bent upwardly, cross-tubes at the ends of said gratebars, and bent tubes I5 connecting them with the ends of the boiler, 

